116 lines
2.9 KiB
Markdown
116 lines
2.9 KiB
Markdown
---
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id: 587d824e367417b2b2512c57
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title: Test if an Object is an Instance of a Constructor
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challengeType: 2
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forumTopicId: 301605
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dashedName: test-if-an-object-is-an-instance-of-a-constructor
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---
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# --description--
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As a reminder, this project is being built upon the following starter project on [Replit](https://replit.com/github/freeCodeCamp/boilerplate-mochachai), or cloned from [GitHub](https://github.com/freeCodeCamp/boilerplate-mochachai/).
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`#instanceOf` asserts that an object is an instance of a constructor.
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# --instructions--
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Within `tests/1_unit-tests.js` under the test labelled `#18` in the `Objects` suite, change each `assert` to either `assert.instanceOf` or `assert.notInstanceOf` to make the test pass (should evaluate to `true`). Do not alter the arguments passed to the asserts.
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# --hints--
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All tests should pass.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
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(data) => {
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assert.equal(data.state, 'passed');
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the first assertion - `instanceOf` vs. `notInstanceOf`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
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(data) => {
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assert.equal(
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data.assertions[0].method,
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'notInstanceOf',
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'myCar is not an instance of Plane'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the second assertion - `instanceOf` vs. `notInstanceOf`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
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(data) => {
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assert.equal(
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data.assertions[1].method,
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'instanceOf',
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'airlinePlane is an instance of Plane'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the third assertion - `instanceOf` vs. `notInstanceOf`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
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(data) => {
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assert.equal(
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data.assertions[2].method,
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'instanceOf',
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'everything is an Object in JavaScript...'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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You should choose the correct method for the fourth assertion - `instanceOf` vs. `notInstanceOf`.
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then(
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(data) => {
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assert.equal(
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data.assertions[3].method,
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'notInstanceOf',
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'myCar.wheels is not an instance of String'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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